I live off I-20, west of Abilene. Have not seen anything but the usual drifting prices. Prices have been between 2.68 and 2.95 and that was Monday before the pipeline thing. Most are in the 2.80s right now. No panic here, no lines at any stations.
The Google Maps route has you coming through Sweetwater, Synder, Lubbock etc - I think you'll be fine. I have to get fuel tonight in the truck, will update later if I need to. I usually get it at the grocery store here, they are typically cheaper or as cheap as others. Usually less than the truck stops. If you find issues - I doubt - you could switch your route a little past Wingate onto 277N towards Abilene, take 707 north just before Caps, go past Dyess AFB to Tye where there is both a Flying J and DK truck stops. Tye also has a Western Marketing fuel storage depot.
Sweetwater has a Walmart Supercenter on the north side of I-20, east of Hyw 70 with pumps. Cross under the freeway on Lamar (70) to Jenny George and turn right, will take you to the Walmart. There's a Alon and a Chevron at the freeway, but they are small stations and usually crowded. West of Sweetwater is a Loves on the north side and a Alon truck stop on the south. There is Pilot and Alon on your side of 84 at Synder - exit is 180 Lamesa/Roby. Route has you go north at Slayton, could go into Lubbock stay on 84, there is a travel center just before the 289 loop. Then go east on the loop around and either go 62 east to Idalou get back on 400, or go on around a little more and catch 27 north to Plainview then Amarillo.